Jurassic

The Jurassic ( ) is a geologic period and stratigraphic system that spanned from the end of the Triassic Period Ma (million years ago) to the beginning of the Cretaceous Period, 143.1 Ma. The Jurassic constitutes the second and middle period of the Mesozoic Era as well as the eighth period of the Phanerozoic Eon and is named after the Jura Mountains, where limestone strata from the period were first identified.